Other
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..195f&link_type=abstract
In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2
Other
12
Uv, Solar Activity, Irradiance
Scientific paper
Since its launch in 1991, the Upper Atmosphere Research Satellite (UARS) has as its goal the study of Earth's stratosphere and mesosphere. Solar UV radiation deposits significant energy in these layers through the creation and destruction of ozone. Two UARS experiments, the Solar-Stellar Intercomparison Experiment (SOLSTICE) and the Solar Ultraviolet Spectral Irradiance Monitor (SUSIM), have measured the solar spectral UV irradiance (119-400 nm) for more than 11 years, the length of a solar activity cycle. These measurements, began during the latter stages of the solar cycle 22 activity maximum continued both through the following minimum and solar cycle 23 maximum. Trends in instrumental responsivity cause some small long-term differences in the UV irradiance measurements between the two experiments. However, the least affected of these, the Mg II core-to-wing ratio index, a solar activity proxy resistant to instrumental changes, shows that peak levels of the two cycles to be about the same. Other accomplishments include the construction of 22+ year Ly-α and Mg II index composite time series, observations of flare enhanced transition regions radiation, and two new solar reference spectra.
DeLand Matthew
Floyd Linton
Pap Judit
Rottman Gary
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